CN113481741A - Bacterial grass chemical mechanical pulp and preparation method and application thereof - Google Patents
Bacterial grass chemical mechanical pulp and preparation method and application thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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Abstract
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a bacterium and grass chemical mechanical pulp and a preparation method and application thereof. The raw material of the chemimechanical pulp is the oasis No. 1 juncao, the content of the holocellulose of the oasis No. 1 is high, the fiber form is good, the fine fiber component is less, the average length of the fiber is longer than that of the conventional broadleaf wood such as eucalyptus, poplar and the like, and the oasis No. 1 is a high-quality pulp fiber raw material in terms of fiber form. The pulping yield of the pulping by adopting the chemical mechanical method is higher, the fiber strength of the prepared pulp is stronger, the pulp quality and the strength and folding resistance of paper boxes or cardboard and the like produced by applying the pulp are improved, and the pulp can replace waste paper pulp to be used for papermaking and pulp molding products of various packaging paper boards. The invention overcomes the defects of low ecological pressure and straw raw material pulping yield, large black liquor generation amount and serious environmental pollution caused by cutting down a large amount of forests in the current pulping of woody raw materials.
Description
Technical Field
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a bacterium and grass chemical mechanical pulp and a preparation method and application thereof.
Background
Chemical mechanical pulp (abbreviated as CMP) is an intermediate product pulp in the paper manufacturing process. The raw materials from which paper is made are various fiber raw materials such as wood, non-wood (e.g., straw, wheat straw, bagasse, bamboo, cotton stalk, etc.), bast-based fibers (hemp, mulberry bark, poncirus trifoliata bark, etc.), waste cotton (or cotton linters), and other fibers. These fibrous materials are first shredded and cooked to produce pulp, and because of the differences in the composition and chemical composition of these fibrous materials, there are different pulping processes. The pulp manufacturing process is to dissociate the fibers in these fiber raw materials by chemical or mechanical methods or a combination of both, and then purify or refine them into unbleached pulp or bleached pulp. The pulping method can be classified into a mechanical method, a chemical method and a chemimechanical method. Among them, chemical-mechanical pulp (CMP) includes chemical-thermal-mechanical pulp (CTMP) and general chemical-mechanical pulp (CMP).
Pulping process in paper manufacture: the ordinary chemimechanical pulp and the chemithermomechanical pulp have no obvious boundary between the two, and the technological process is also extremely similar. Chemicals used for treating wood chips, whether CMP and CTMP, are sodium sulfite, caustic soda-sodium sulfite, caustic soda. In general, sodium sulfite (or a small amount of sodium hydroxide) is generally used for coniferous wood, and sodium hydroxide (a small amount of sodium sulfite) is generally used for broadleaf wood. The main factors influencing the quality of the paper pulp include wood species, wood chip quality, pulp concentration, presteaming conditions, chemical impregnation conditions, pulp grinding pressure, disc mill structure, disc mill revolution and the like.
The raw material wood chips of ordinary Chemical Mechanical Pulp (CMP) are subjected to a relatively intensive chemical treatment, the pulp yield is relatively low and the refining can be carried out at atmospheric pressure. The chemical treatment condition of general needle-leaf material is that the sodium sulfite concentration of cooking liquor is 12-17%, and the preheating is implemented at 130-170 deg.C for 10-60min, and the cooked wood chip is passed through the processes of extruding excess liquor and making two-stage pulp-grinding, and between two-stage pulp-grinding a washing device is always set. The chemical treatment of broad-leaved wood adopts 15-20% sodium sulfite cooking liquor, the temperature is 160 ℃ and the cooking is 15-40min, and the CMP yield is 86-88%.
The chemical thermomechanical pulp (CTMP) wood chip is chemically treated before pulping, and the aim is to soften wood, make fiber soft and raise binding force between fibers on the basis of keeping wood components as unchanged as possible, so that the composition of long fiber is obviously raised compared with CMP, and the optical property of paper sheet is changed and the strength of paper sheet is raised. The presteaming temperature of the wood chips is 125-130 ℃, the presteaming temperature is 2-3min, and the using amount of the needle leaf sodium sulfite is 2-3%; the using amount of the broad-leaved sodium sulfite is 3-4%, the using amount of the sodium hydroxide is 2-3%, and the yield of the CTMP is 90-92%.
Recycling the waste cooking liquor: the cooking liquor contains a large amount of lignosulphonate, sugar and degradation products thereof, inorganic matters and the like, has high BOD and COD, and is an important environmental protection subject of the neutral sulfite pulp industry after being well recycled.
Compared with chemical pulping, chemical mechanical pulping (abbreviated as chemi-mechanical pulping) has many advantages, such as high yield, low energy consumption per ton of pulp, low pollution degree, low equipment investment, etc. The current chemi-Mechanical Pulp mainly includes pre-impregnated Alkaline hydrogen peroxide Mechanical Pulp (PRC-APMP) and bleached chemi-Thermomechanical Pulp (BCTMP). The chemi-mechanical pulp is cheaper than chemical pulp, and the bulk and opacity of the finished paper can be improved after the chemi-mechanical pulp is applied. Therefore, in many paper mills, partially differentiated mechanical pulp is used to replace chemical pulp to achieve the purpose of improving the quality of finished paper and reducing the production cost.
Grass raw materials, such as wheat straw, are the main raw materials of the paper industry in China and account for more than 50 percent of the raw materials of the paper industry in China. At present, straw raw materials such as wheat straw and the like are mainly pulped by a chemical method, such as a caustic soda method, a sulfate method and the like, the pulping yield is low (generally lower than 50 percent), and a large amount of black liquor generated in the production process is difficult to effectively recover, so that the problem of serious environmental pollution is caused. According to statistics, the Chemical Oxygen Demand (COD) in wastewater discharged by the pulping and papermaking industry in 1998 accounts for about 46 percent of the total COD discharge of the national industry, and is the first (international papermaking, 2000, 5: 20), wherein black liquor is the main source of COD. Therefore, the research on the mechanical pulping technology of the grass raw materials with high pulp yield and low pollution degree has important significance. However, compared with wood, the fiber length of straw raw materials such as wheat straw and the like is relatively short, if a pure mechanical pulping method is adopted, the strength of paper pulp is greatly damaged due to excessive fiber cutting in the pulping process, so that the chemical mechanical pulping process with chemical pretreatment is more suitable for preparing the paper pulp with better strength performance by using the straw raw materials, and the APMP pulping process has a plurality of advantages, so that the research on the APMP pulping of the wheat straw raw materials has more practical significance and environmental protection significance.
The method for alkaline hydrogen peroxide mechanical pulping by using CN03139030.7 grass raw materials comprises the steps of hot water impregnation, extrusion dehydration, first chemical pretreatment, first-stage pulping, enzyme treatment, second-stage chemical pretreatment, second-stage pulping and the like; wherein the enzyme treatment is performed after the first stage of pulping and before the second chemical pretreatment, the used enzyme solution is a hemicellulase solution or a mixed enzyme solution of hemicellulase and lignin peroxidase, the enzyme treatment condition is that the concentration is 3-15%, the time is 30-180 minutes, the temperature is 40-70 ℃, the system pH is 3.5-6.5, the dosage of xylanase is 2-40IU per gram of oven-dried raw material, and the dosage of lignin peroxidase is 0.1-1.0IU per gram of oven-dried raw material; the method has the advantages of high whiteness, good strength, easy treatment of waste liquid and the like of the prepared paper pulp, and can be applied to paper making enterprises taking grasses as raw materials.
CN200610042014.5 grass family plant rapid cold soaking mechanical pulping process, dedusting → medicated cold soaking → washing → medicated pulp grinding → pulp squeezing → medicated pulp mixing → bleaching → washing → medicated white extraction. The invention has the beneficial effects that: the advantages of the new process method are as follows: (1) the cold soaking time is greatly shortened and only needs about 4 hours; (2) the washing process is carried out before pulping, thereby greatly reducing washing equipment, reducing energy consumption, saving water source and greatly reducing the pulping cost; (3) the pulping process and the bleaching process are carried out synchronously; (4) the whiteness of the gramineous plant fiber is improved by the whitening process, and a new breakthrough is realized; (5) the process has less investment on equipment, saves a large amount of energy and is more suitable for large-scale industrial production.
CN102720085A A process for preparing wheat straw chemi-mechanical pulp based on ammonia pretreatment comprises shearing wheat straw to 3.0-5.0cm, pretreating in a laboratory digester while adding urea and potassium hydroxide, heating, holding temperature, taking out grass, measuring kappa number, and pulping. The handsheets were made by using a laboratory handsheet former, and the ring crush strength index of the resulting handsheets was 9.43N · m/g, the breaking length was 4.87Km, and the tautness was 0.53g/cm3The method achieves the level A in the national standard of corrugated medium, the carbon content of the waste liquid generated in the pretreatment process is 0.69g/L, the nitrogen content is 0.039g/L, the phosphorus content is 0.014g/L, the potassium content is 0.15g/L, and the pH value is 8.5, so that the waste liquid can be used as the base liquid for preparing organic fertilizer, and the purpose of comprehensively treating the waste liquid is achieved.
CN 201810414201.4A process for producing fulvic acid fertilizer and high-strength corrugated paper by using all cotton straws as raw materials the invention provides a process for producing fulvic acid fertilizer and high-strength corrugated paper by using all cotton straws as raw materials, which adopts weak acid ammonium sulfite pulping process, prepares pulping red liquid rich in fulvic acid for producing fertilizer by optimizing and combining the pulping process links of cooking temperature, cooking time, pH value, high-concentration pulp grinding and the like, and simultaneously produces high-performance paper pulp with lighter color for producing high-strength corrugated paper. The invention avoids the defects and shortcomings of strong alkali and strong acid processes, overcomes the differences of the properties, components and structures of the all-cotton straw raw materials, effectively utilizes the effective components contained in the cotton straw core, the cotton straw pulp, the cotton boll hull and the cotton straw skin in the all-cotton straw to produce the fulvic acid, effectively exerts the advantage of the combination of the length and the length of the all-cotton straw fibers to produce the high-strength corrugated paper, realizes the comprehensive utilization of the all-cotton straw resources, and opens up the technical path of the industrial and commercial utilization of the all-cotton straw raw materials.
Disclosure of Invention
In view of the above technical problems in the background art, there is a need to provide a bacterial and grassed mechanical pulp, a preparation method and an application thereof, which can overcome the disadvantages of ecological pressure and low pulping yield of the raw materials, large amount of black liquor generation and serious environmental pollution caused by cutting down forests in the current pulping of woody raw materials.
To achieve the above object, in a first aspect of the present invention, the inventors provide a bacterial grass slurry having a Canadian freeness of 260-275mL and a bulk of 2.40-3.20cm3(ii)/g, burst index of 0.60-1.30kPa · m2(g) tear index 2.2-4.5mN · m2(ii) a tensile index of 15.5 to 26.8 N.m/g.
In a preferred embodiment of the present invention, the juncus is oasis No. 1.
As a preferred embodiment of the present invention, the bacterial grass pulp has a Canadian freeness of 270mL and a bulk of 2.44cm3(ii)/g, burst index of 1.26kPa · m2G, tear index 4.23 mN.m2(ii) a tensile index of 26.69 N.m/g.
In a second aspect of the present invention, the inventors provide a method for preparing a bacterial grass chemimechanical pulp according to the first aspect of the present invention, comprising the steps of:
pre-steaming the oasis No. 1 grass pieces which are sliced, washed and dehydrated to obtain softened grass pieces;
carrying out first-stage extrusion on the softened grass sheet, and then carrying out first-stage chemical impregnation to obtain a first material to be ground;
carrying out second-stage extrusion on the first material to be ground and then carrying out second-stage chemical impregnation to obtain a second material to be ground;
carrying out first high-concentration pulping and second high-concentration pulping on the second material to be ground to obtain primary bacterium grass pulp;
and washing, screening and concentrating the primary mushroom grass pulp in sequence to obtain the mushroom grass chemimechanical pulp finished product.
In a preferred embodiment of the present invention, the first stage chemical impregnation is performed with 3% sodium hydroxide, the first stage chemical impregnation temperature is >90 ℃, and the impregnation time is 45-50 min.
In a preferred embodiment of the invention, the amount of sodium hydroxide used in the second stage of chemical impregnation is 3-5%, the temperature of the first stage of chemical impregnation is >90 ℃, and the impregnation time is 45-60 min.
As a preferred embodiment of the present invention, the presteaming temperature is 105 ℃ and the time is 15-20 min.
In a third aspect of the invention, the inventors provide a linerboard prepared from the bacterial grass-based organic pulp of the first aspect of the invention.
In a fourth aspect of the present invention, the inventors provide a corrugated medium prepared by using the bacterial grass chemi-mechanical pulp of the first aspect of the present invention.
In a fifth aspect of the invention, the inventors provide the use of a bacterial-herbicidal mechanical pulp according to the first aspect of the invention.
Different from the prior art, the technical scheme at least has the following beneficial effects:
the raw material of the chemimechanical pulp is the oasis No. 1 juncao, the content of the holocellulose of the oasis No. 1 is high, the fiber form is good, the fine fiber component is less, the average length of the fiber is longer than that of the conventional broadleaf wood such as eucalyptus, poplar and the like, and the oasis No. 1 is a high-quality pulp fiber raw material in terms of fiber form. The pulping yield of the pulping by adopting the chemical mechanical method is higher, the fiber strength of the prepared pulp is stronger, the pulp quality and the strength and folding resistance of paper boxes or cardboard and the like produced by applying the pulp are improved, and the pulp can replace waste paper pulp to be used for papermaking and pulp molding products of various packaging paper boards.
Drawings
FIG. 1 is a flowchart of a chemical mechanical pulping test of Juncao in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of the power consumption test result of the oasis No. 1 strain grass mechanical pulp refining according to the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the results of a Mesona machine-pulped bulk test on oasis No. 1 according to the embodiment of the present invention;
FIG. 4 is a graph showing the results of a tensile strength test of Haematococcus 1 mechanical pulp according to an embodiment of the present invention;
FIG. 5 is a graph showing the burst strength test results of Haworthia 1 Mesona chinensis slurry according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a tear strength test result of the oasis No. 1 bacterial lawn mower pulp according to the embodiment of the present invention.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
The invention analyzes the fiber shape and chemical composition of the oasis 1 grass raw material adopted by the specific embodiment. The fiber morphology of the oasis 1 juncao mainly comprises: average length, average width, length/width ratio, wall to cavity ratio, double wall thickness, cavity diameter, and the like. The chemical composition of the oasis 1 juncao mainly comprises: ash, 1% NaOH extract, holocellulose, lignin, pentosan and the like.
The performance of the oasis 1 bacterial grass machine pulp obtained by the specific implementation mode is tested and analyzed, the grinding energy consumption, the pulp yield and the Canadian freeness of the oasis 1 bacterial grass machine pulp obtained under different process conditions are measured, and the main physical strength performance of the oasis 1 bacterial grass machine pulp comprises the following main physical strength performances: quantitative, bulk, tensile strength, tear strength, burst strength, etc. were tested. The test analytical instrument or method is as follows:
a) recording and calculating the energy consumption of grinding
Unit pulping power consumption (kWh/BDT) ═ total pulping power consumption kWh-no-load power consumption kWh)/absolute dry pulp mass (BDT)
b) Latency elimination
This was carried out using a standard fluffer from Messer, UK.
c) Screening
The screening was carried out using a sieve of Voith company, USA.
d) Paper sheet making
Making into 60g/m according to the national standard (GB/T24324-2009 laboratory paper sheet preparation routine paper sheet former method for pulp physical test)2Paper sheets were quantified and tested for pulp properties.
e) Physical examination
The sheets were treated overnight in a constant temperature and humidity laboratory, and the sheets were removed and tested according to standard specifications:
i. quantification: according to GB/T451.2-2002: paper and board basis weight measurements;
thickness: according to GB/T451.3-2002: the paper and board caliper was measured using an ZHD-4 model caliper gauge;
tear strength: according to GB/T455-: determination of the tear resistance of paper and cardboard was carried out using an apparatus model ME1653D tear tester (UK)
Burst strength: according to GB/T454-2002: the paper bursting strength is measured by using an ME-05 paper bursting strength instrument;
v. tensile strength: according to GB/T12914 and 2018: the tensile strength of paper and board was measured (constant rate drawing) using a BR-165 horizontal tensile tester (UK) and the elongation, breaking length and T.E.A. were measured simultaneously.
The bacterial grass of oasis 1 adopted in the specific embodiment of the invention is provided by Fujian Zhengyuanjuncao International cooperative Limited liability company, and through observation, the raw material of the bacterial grass of oasis 1 is fresh and has no mildew phenomenon. After the above analysis, the chemical composition and fiber morphology test results of the oasis 1. mycorrhiza grass are obtained and are shown in tables 1 and 2, respectively.
TABLE 1 chemical composition analysis of Juncao No. 1 oasis
TABLE 2 morphological analysis results of No. 1 Haematitum grass fibers in oasis
The test results in table 1 show that the raw material of the grasses of oasis No. 1 has a low lignin content and high ash and extract contents, and thus, the chemical components of the raw material of the grasses of oasis No. 1 are closer to those of grass raw materials. The test results in table 2 show that the fibrous form of the grasses of oasis 1 is excellent, the content of fine fibers in the raw material is low, the average length of the fibers is longer than that of the conventional broad-leaved wood such as eucalyptus and poplar, and the grasses of oasis 1 are high-quality pulping fiber raw materials in terms of fibrous form.
Example 1 oasis No. 1 bacterial grass chemi-mechanical pulp and method of preparing the same
Referring to a chemical mechanical pulping process flow chart shown in fig. 1, cutting the oasis 1 junci grass into 3-5cm chopped grass pieces, washing and dehydrating the chopped grass pieces, then pre-steaming at 105 ℃ for 15min to obtain softened oasis 1 junci grass pieces, then performing first-stage extrusion by using a twin-screw extruder (TSPI), performing first-stage chemical impregnation on the extruded materials of the first stage by using sodium hydroxide, wherein the amount of the sodium hydroxide used in the first-stage chemical impregnation is 3%, namely 30kg/BDT (BDT is per ton of absolute dry pulp, namely 30kg of sodium hydroxide is used per ton of absolute dry pulp), the concentration of the first-stage chemical impregnation is 30% (concentration of reaction material aqueous solution of a chemical system), the temperature of the first-stage chemical impregnation is greater than 90 ℃, and the impregnation time is 45min, so as to obtain a first material to be ground. And (2) performing second-stage extrusion on the first material to be ground by using a double-screw extruder (TSPI), and then performing second-stage chemical impregnation, wherein the using amount of sodium hydroxide in the second-stage chemical impregnation is 3%, namely 30kg/BDT (BDT is per ton of oven dry pulp, namely 30kg of sodium hydroxide is used per ton of oven dry pulp), the second-stage chemical impregnation concentration is 30% (the concentration of a reaction material aqueous solution of a chemical system), the second-stage chemical impregnation temperature is more than 90 ℃, and the impregnation time is 45min, so that a second material to be ground is obtained. And extruding the second section to obtain a second material to be ground. And (3) carrying out first high-consistency refining and second high-consistency refining on the second material to be ground, wherein the first high-consistency refining and the second high-consistency refining are normal-pressure high-consistency refining, and grinding pulp samples with different Canadian freenesses by inputting different refining power consumptions (the refining power consumption is recorded in the refining process) to obtain the primary Juncao pulp. And washing, screening and concentrating the primary mushroom grass pulp in sequence to enable the pulp concentration to be 25-30%, and obtaining a finished product of the oasis No. 1 mushroom grass chemi-mechanical pulp.
Example 2 Ooasis number 1 bacterial grass chemi-mechanical pulp and method of making the same
The difference from example 1 is that the first stage chemical impregnation time is 50min, the amount of sodium hydroxide used in the second stage chemical impregnation is 4%, i.e. 40kg/BDT (BDT is 40 kg/ton of oven dry pulp, i.e. per ton of oven dry pulp), the second stage chemical impregnation temperature is >90 ℃, and the impregnation time is 60min, resulting in the second material to be ground. The remaining operation steps were the same as in example 1, to obtain bacterial manure mechanical pulp of oasis No. 1 of example 2.
Example 3 Ooasis number 1 bacterial grass chemi-mechanical pulp and method of making the same
The difference from example 1 is that the first stage chemical impregnation time is 50min, the amount of sodium hydroxide used in the second stage chemical impregnation is 5%, i.e. 50kg/BDT (BDT is 50 kg/ton of oven dry pulp, i.e. 50 kg/ton of oven dry pulp), the second stage chemical impregnation temperature is >90 ℃, and the impregnation time is 60min, resulting in the second material to be ground. The remaining operation steps were the same as in example 1, to obtain bacterial manure mechanical pulp of oasis No. 1 of example 3.
The invention respectively grinds 4 pulp samples with different Canadian freeness by inputting different grinding power consumption to the materials under different dipping conditions of the examples 1-3. After the pulp samples with different Canadian freeness are latency-eliminated, washed and screened, 60g/m is manufactured according to the national standard2The sheets were quantified and the physical properties of the pulp were measured under standard atmospheric conditions to obtain the results shown in tables 3-5.
TABLE 3 Mesona performance of chemical mechanical pulping of Juncao, oasis 1, example 1
TABLE 4 Mesona performance of chemical mechanical pulping of Juncao, oasis No. 1, of example 2
TABLE 5 Mesona performance of chemical mechanical pulping of Juncao, oasis No. 1, example 3
As can be seen from the results in tables 3-5, the chemico-mechanical pulping of Juncao in oasis has a higher yield (higher than that of other grasses) and is directly related to the amount of impregnating chemicals. Comparing the pulping yield under different soaking conditions, the pulping yield is gradually reduced along with the increase of the dosage of chemicals (sodium hydroxide), which is mainly because when the dosage of alkali in the soaking section is large, the extract in the raw materials is dissolved out by the alkali, and the degradation of lignin, cellulose and hemicellulose is increased, so that the pulping yield is reduced. In general, the chemical mechanical pulping is adopted, the yield of the oasis 1 junci grass is higher, and the pulping yield can still reach more than 81 percent when the total dosage of the sodium hydroxide for two-stage chemical impregnation is 7 percent (example 2).
The electricity consumption of the pulping is one of the main constituent elements of the pulping cost of the chemical mechanical method, and the difference of the electricity consumption of the pulping for preparing the chemical mechanical pulp by different material species is large due to the difference of the material property of the raw material and the anatomical property of fiber cells. Figure 2 is prepared for oasis No. 1 bacterial grassing machine pulps of examples 1-3 with canadian freeness as the abscissa and refining power consumption as the ordinate. FIG. 2 shows electricity consumption of pulping in chemical mechanical pulping of No. 1 Juncao in oasis under different application conditions.
As can be seen from figure 3, the pulping electricity consumption of the No. 1 oasis junci grass is lower by adopting the chemical mechanical pulping method: when the total amount of the sodium hydroxide used in the two stages of chemical impregnation is 6-8%, the pulp with the Canadian freeness of about 300mL is prepared, and the electricity consumption of the refining is between 532-378kWh/T pulp. Compared with the power consumption of grinding under different dipping conditions, the power consumption of grinding is gradually reduced along with the increase of the dosage of chemicals (sodium hydroxide), mainly because when the dosage of alkali in the dipping section is large, the dipping effect of the raw materials is better, the alkali can more fully soften the No. 1 juncao raw materials of oasis, the pulp fibers are easy to separate in the grinding process, and the energy consumption of grinding is lower. In general, the electricity consumption of pulping required by adopting a chemical mechanical method to pulp the No. 1 fungus grasses in oasis is less, which is beneficial to reducing the pulping cost in the actual production.
The bulk (tightness) is an important index for measuring chemi-mechanical pulp, and the paper pulp with high bulk (low tightness) can ensure that the paperboard has high ring crush strength and stiffness, and in addition, the consumption of pulp in the paperboard production process can be reduced, and the production cost can be obviously reduced. Generally, the tightness of the pulp is directly related to the dosage of chemicals, the tightness of the chemical pulp is higher than that of the chemimechanical pulp mainly due to the difference of the action degrees of the chemicals, the chemical pulping is delignification pulping, pulp fibers become very flexible, and fiber cell walls are very easy to collapse and flatten when a paper sheet is formed, so that the denser paper sheet is formed, and the higher tightness is shown. The chemi-mechanical pulp is a pulping method with the lignin retained, and the fiber cell walls in the pulp contain more lignin, so that the pulp fibers are stiffer, and the formed paper sheets are thicker and show higher bulk or lower tightness. FIG. 3 shows a comparison of the bulk of the pulp produced by the chemico-mechanical method of Juncao, oasis No. 1 of examples 1-3, under different impregnation conditions.
FIG. 3 shows that the bulk of the chemi-mechanical pulp prepared from Juncao Haworthia oasis No. 1 is superior to that of the ordinary waste paper pulp (about 1.8 cm)3In terms of/g). In addition, the bulk of the chemi-mechanical pulp is mainly related to the amount of sodium hydroxide used for impregnation, and the bulk depends on the amount of sodium hydroxide used for impregnationThe alkali consumption of the impregnation section is reduced due to the fact that the impregnation effect is better along with the increase of the chemical consumption, the raw materials are softened more fully, the fibrillation effect of the paper pulp fibers is better in the pulping process, and the fibers are better and more compact in combination when paper sheets are formed and show lower bulk.
The strength properties of the pulp mainly include tensile, burst and tear strength, etc. It is theorized that tensile strength and burst strength are primarily related to the strength of the bonds between pulp fibers, which is related to the degree of cell wall fibrillation of the fibers during refining. It is believed that tear strength is more strongly related to the average fiber length of the pulp. This is probably because, when pulping by chemical mechanical method, the average length difference of the pulp fibers is not large after disc grinding, and the pulp is well presoaked, so that the raw materials are fully softened and swelled, not only can the pulp fibers be well devillicate and broomed, but also the bonding force between fibers is improved, the damage and the cutting of the fibers in the pulping process are reduced, and the better pulp strength is ensured. Therefore, under the condition of certain raw materials, the good chemical pre-soaking effect and the proper refining process technology directly determine the bonding strength and the tearing strength of the paper pulp in the pulping process. FIGS. 4-6 show a comparison of tensile, burst and tear strength properties of the pulps produced by the chemical mechanical process from Juncao, Nos. 1, of EXAMPLES 1-3 oasis.
FIGS. 4 to 6 show that the chemical mechanical process for preparing the paper pulp from Juncao in oasis No. 1 in examples 1 to 3 has excellent tensile strength and bursting strength, and the total amount of sodium hydroxide used in the two-stage chemical impregnation is 7%, so that the prepared Juncao-type organic pulp in oasis No. 1 with the Canadian freeness of 300mL can reach the tensile strength of more than 29 N.m/g, which is superior to the strength of domestic waste paper pulp, and therefore, the paper pulp can completely replace the waste paper pulp to be used for manufacturing various packaging paper boards. Furthermore, the tensile strength of the pulp increases significantly with the amount of impregnation used. Thus, if it is desired to produce a pulp with higher strength for paper furnish for high-end paper products, it can be achieved by increasing the amount of impregnating chemical appropriately.
Example 4 Mesona-1 Membranaceae bleached chemi-mechanical pulp and method for making same
The first stage chemical impregnation conditions and the second stage chemical impregnation conditions in the manufacturing process of the chemical mechanical method pulp of the juniper 1 juniper of the examples 1 to 3 were modified to obtain the bleaching chemical mechanical method pulp process of the juniper 1 juniper as shown in the table 6 in the example.
TABLE 6 pulping process conditions of P-RC APMP bleached chemi-mechanical pulp of oasis No. 1
The results of the bleaching chemical mechanical property preliminary study of the oasis 1 junci grass according to the present invention are shown in table 7.
TABLE 7 pulping performance of Mesona-grass bleaching chemical mechanical method in oasis 1
The results in table 7 show that the whiteness of the grass bleached chemi-mechanical pulp prepared by adopting the bleaching chemi-mechanical pulp making method is lower, when the total consumption of the two sections of chemically-impregnated hydrogen peroxide is 80kg/t pulp, the whiteness is only about 53% ISO, and higher whiteness is difficult to obtain, which is similar to the result of adopting the chemi-mechanical pulp bleaching method to prepare other non-wood raw materials, so that the grass raw material of oasis No. 1 is not recommended to be used for producing the high-whiteness bleached chemi-mechanical pulp.
From the difference of the performance test results of the chemi-mechanical pulp and the bleached chemi-mechanical pulp, the oasis 1 junci grass is low in lignin content, long in average fiber length and low in fine fiber content, and is a high-quality pulping fiber raw material.
The pulping process of the natural colorized machine pulp prepared from the oasis No. 1 juncao by adopting the chemical mechanical method has lower power consumption and better strength performance, and can replace waste paper pulp to be used for papermaking of various packaging paper boards and pulp molding products.
Similar to other nonwood raw materials, Juncao Hainan No. 1 is difficult to prepare chemi-mechanical pulp with higher whiteness by a chemical mechanical method, and is not recommended to be used for producing bleached pulp.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (10)
1. The strain grass chemical-mechanical pulp is characterized in that the Canadian freeness is 260-275mL, and the bulk is 2.40-3.20cm3(ii)/g, burst index of 0.60-1.30kPa · m2(g) tear index 2.2-4.5mN · m2(ii) a tensile index of 15.5 to 26.8 N.m/g.
2. The bacterial grass-chemical mechanical pulp of claim 1, wherein the bacterial grass is oasis No. 1.
3. The bacterial lawn mower slurry of claim 1, wherein said bacterial lawn mower slurry has a canadian freeness of 270mL and a bulk of 2.44cm3(ii)/g, burst index of 1.26kPa · m2G, tear index 4.23 mN.m2(ii) a tensile index of 26.69 N.m/g.
4. A method of preparing a bacterial lawn machine slurry according to any of claims 1-3, comprising the steps of:
pre-steaming the oasis No. 1 grass pieces which are cut, washed and dehydrated to obtain softened grass pieces;
carrying out first-stage extrusion on the softened grass sheet, and then carrying out first-stage chemical impregnation to obtain a first material to be ground;
carrying out second-stage extrusion on the first material to be ground and then carrying out second-stage chemical impregnation to obtain a second material to be ground;
carrying out first high-concentration pulping and second high-concentration pulping on the second material to be ground to obtain primary bacterium grass pulp;
and washing, screening and concentrating the primary mushroom grass pulp in sequence to obtain the mushroom grass chemimechanical pulp finished product.
5. The preparation method according to claim 4, wherein the amount of sodium hydroxide used in the first stage of chemical impregnation is 3%, the temperature of the first stage of chemical impregnation is >90 ℃, and the impregnation time is 45-50 min.
6. The preparation method according to claim 4, wherein the amount of sodium hydroxide used in the second stage of chemical impregnation is 3-5%, the temperature of the first stage of chemical impregnation is >90 ℃, and the impregnation time is 45-60 min.
7. The method for preparing according to claim 4, characterized in that the presteaming temperature is 105 ℃ and the time is 15-20 min.
8. A linerboard produced using the bacterial lawn machine pulp of any of claims 1-3.
9. A corrugated medium prepared by using the bacterial grass chemi-mechanical pulp of any one of claims 1-3.
10. Use of the bacterial lawn machine pulp of any of claims 1-3.
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